/*
 * Copyright (c) 2006, National ICT Australia
 */
/*
 * Copyright (c) 2007 Open Kernel Labs, Inc. (Copyright Holder).
 * All rights reserved.
 *
 * 1. Redistribution and use of OKL4 (Software) in source and binary
 * forms, with or without modification, are permitted provided that the
 * following conditions are met:
 *
 *     (a) Redistributions of source code must retain this clause 1
 *         (including paragraphs (a), (b) and (c)), clause 2 and clause 3
 *         (Licence Terms) and the above copyright notice.
 *
 *     (b) Redistributions in binary form must reproduce the above
 *         copyright notice and the Licence Terms in the documentation and/or
 *         other materials provided with the distribution.
 *
 *     (c) Redistributions in any form must be accompanied by information on
 *         how to obtain complete source code for:
 *        (i) the Software; and
 *        (ii) all accompanying software that uses (or is intended to
 *        use) the Software whether directly or indirectly.  Such source
 *        code must:
 *        (iii) either be included in the distribution or be available
 *        for no more than the cost of distribution plus a nominal fee;
 *        and
 *        (iv) be licensed by each relevant holder of copyright under
 *        either the Licence Terms (with an appropriate copyright notice)
 *        or the terms of a licence which is approved by the Open Source
 *        Initative.  For an executable file, "complete source code"
 *        means the source code for all modules it contains and includes
 *        associated build and other files reasonably required to produce
 *        the executable.
 *
 * 2. THIS SOFTWARE IS PROVIDED ``AS IS'' AND, TO THE EXTENT PERMITTED BY
 * LAW, ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
 * PURPOSE, OR NON-INFRINGEMENT, ARE DISCLAIMED.  WHERE ANY WARRANTY IS
 * IMPLIED AND IS PREVENTED BY LAW FROM BEING DISCLAIMED THEN TO THE
 * EXTENT PERMISSIBLE BY LAW: (A) THE WARRANTY IS READ DOWN IN FAVOUR OF
 * THE COPYRIGHT HOLDER (AND, IN THE CASE OF A PARTICIPANT, THAT
 * PARTICIPANT) AND (B) ANY LIMITATIONS PERMITTED BY LAW (INCLUDING AS TO
 * THE EXTENT OF THE WARRANTY AND THE REMEDIES AVAILABLE IN THE EVENT OF
 * BREACH) ARE DEEMED PART OF THIS LICENCE IN A FORM MOST FAVOURABLE TO
 * THE COPYRIGHT HOLDER (AND, IN THE CASE OF A PARTICIPANT, THAT
 * PARTICIPANT). IN THE LICENCE TERMS, "PARTICIPANT" INCLUDES EVERY
 * PERSON WHO HAS CONTRIBUTED TO THE SOFTWARE OR WHO HAS BEEN INVOLVED IN
 * THE DISTRIBUTION OR DISSEMINATION OF THE SOFTWARE.
 *
 * 3. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR ANY OTHER PARTICIPANT BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
 * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <stdio.h>

#ifdef __USE_POSIX
#include <posix/pthread.h>
#endif

#include <string.h>
#include <errno.h>
#include <l4/kdebug.h>
#include <assert.h>

int
fputc(int c, FILE *stream)
{

/* If in POSIX environment, this is a cancellation point */
#ifdef __USE_POSIX
    pthread_testcancel();
#endif

    unsigned char ch = (unsigned char)c;
    int r;

    /* If file is buffered, add to buffer */
    if (stream->buffering_mode != _IONBF) {
        lock_stream(stream);
        *stream->buffer_end++ = ch;
        stream->current_pos++;
        unlock_stream(stream);

        /* If the buffer is full, or it is line buffered and this is a new line, flush
           We can't be locked when we make this call */
        if ((stream->buffering_mode == _IOLBF && ch == '\n') ||
            (stream->buffer_end - stream->buffer >= stream->buffer_size - 1)) {
            fflush(stream);
        }

    } else {
        lock_stream(stream);
        assert(stream->write_fn != NULL);
        r = stream->write_fn(&ch, stream->current_pos, 1, stream->handle);
        if (r == 1) {
            stream->current_pos++; /* Success */
        } 
        else if (r == 0) {
            c = EOF;
            stream->eof = 1;
        } else {
            c = EOF;
            stream->eof = 1;
            stream->error = errno;
        }
        unlock_stream(stream);
    }

    return c;
}
